Heat Transfer Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by Enhancing the fluid pumping rate Increasing the tube length Keeping the heat transfer surface clean None of these Enhancing the fluid pumping rate Increasing the tube length Keeping the heat transfer surface clean None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second. 10 1 20 30 10 1 20 30 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The actual temperature drop across the heating surface in an evaporator depends on the Pressure difference between steam chest and vapour space All of these Feed Depth of liquid over heating surface Pressure difference between steam chest and vapour space All of these Feed Depth of liquid over heating surface ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Grashhoff number is given by gD³.β.Δtρ²/μ² gD³βΔtP²/μ gD2βΔtρ/μ² gD2βΔtP²μ gD³.β.Δtρ²/μ² gD³βΔtP²/μ gD2βΔtρ/μ² gD2βΔtP²μ ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately 37 50 45 32 37 50 45 32 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be Less than the steam pipe with 5 cms insulation Greater than that for uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than that of the uninsulated steam pipe Less than the steam pipe with 5 cms insulation Greater than that for uninsulated steam pipe Equal to that of the uninsulated steam pipe Less than that of the uninsulated steam pipe ANSWER DOWNLOAD EXAMIANS APP
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